Every text I’ve read that has anything to do with genre study dedicates at least a few paragraphs to the disclaimer that genre is slippery, arbitrary, and, while a useful tool for analysis, kind of a pain in the ass. This pain is only made worse if we take this system of categories to be Holy Doctrine rather than something we made up to make talking about stories easier. So, okay, maybe genre isn’t fake. When I say genre is “made up” I mean genre is “socially constructed”, rather than “not real”. Here, Brian Attebery says it better:
Both literary studies and folklore are built on the idea of genres, rather as biology is built on categories, from kingdom to species, reflecting morphological similarity and common descent. However, unlike, say, raptors and perching birds, different genres do not exist until someone imagines them.